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ESG Family Signal Generators Assembly Replacement
A4 Power Supply (with Option 1EM)
Service Guide 5-15
A4 Power Supply (with Option 1EM)
Tools Required
• T-10 TORX screwdriver
Removal
1. Remove the front panel assembly. (Refer to the “Front Panel” replacement procedure on
page 5-60.)
2. Remove the bottom cover by removing the 15 screws that secure it.
3. Remove the screw (item 1 in Figure 5-8) that attaches the CPU/motherboard (A14) to
the bottom of the power supply shield (item 2).
4. Disconnect A16W1 from the power supply (A4).
5. Remove the two screws (item 3) that attach the line module (A16) to the rear panel.
6. Remove the line module and A16W1 from the opening in the rear panel. The line
module will remain connected to the rear panel, however, via the ground wire, A16W2.
(See Figure 5-9 on page 5-17.)
7. Remove the three screws (item 4 in Figure 5-8) that attach the rear panel to the power
supply shield.
8. Disconnect A4W1 from the CPU/motherboard (A14). (See Figure 5-9 on page 5-17.)
9. Remove the five screws (item 5) that attach the power supply shield (item 2) to the
instrument chassis (item 6).
10.Pull the power supply shield away from the instrument chassis.
11.Remove the 12 screws (item 7) that attach the power supply to the power supply shield.
12.Remove the power supply (A4) from the front end of the shield.
Replacement
1. Reverse the removal procedure and torque all T-10 TORX screws to 9 in-lbs.